Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Changes in Fair Value of Financial Instruments (Detail)

v3.10.0.1
Fair Value Measurements - Changes in Fair Value of Financial Instruments (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance $ 21,833
Payment of convertible notes (4,076)
Reclassification of warrant liability from debt to equity (13,615)
Change in fair value of investments (825)
Change in fair value of convertible notes (110)
Change in fair value of derivative liabilities 7,931
Balance 11,138
Helocyte Convertible Note At Fair Value [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance 4,700
Payment of convertible notes (4,076)
Reclassification of warrant liability from debt to equity 0
Change in fair value of investments 0
Change in fair value of convertible notes (291)
Change in fair value of derivative liabilities 0
Balance 333
Warrants Issued Issuable [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance 5,597
Payment of convertible notes 0
Reclassification of warrant liability from debt to equity (13,615)
Change in fair value of investments 0
Change in fair value of convertible notes 0
Change in fair value of derivative liabilities 8,018
Balance 0
Caelum Convertible Notes, at fair value [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance 10,059
Payment of convertible notes 0
Reclassification of warrant liability from debt to equity 0
Change in fair value of investments 0
Change in fair value of convertible notes 181
Change in fair value of derivative liabilities 0
Balance 10,240
Warrant liabilities [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance 87
Payment of convertible notes 0
Change in fair value of investments 0
Change in fair value of convertible notes 0
Change in fair value of derivative liabilities (87)
Balance 0
Investment In Origo [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance 1,390
Payment of convertible notes 0
Reclassification of warrant liability from debt to equity 0
Change in fair value of investments (825)
Change in fair value of convertible notes 0
Change in fair value of derivative liabilities 0
Balance $ 565