Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.19.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Aug. 15, 2018
Jul. 03, 2018
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Share Price       $ 3.04  
Fair Value Assumptions Probability Of Business Combination   46.53%      
Common Stock Redemption Price Per Share     $ 11.00    
Time to Expected Business Combination or liquidation   0.05%      
Helocyte [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 0 $ 87     $ 167
Origo Acquisition Corporation [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment Owned, at Fair Value   1,400      
Investments In Subsidiary Number Of Shares Transferred To Subsidiary 1,050,000        
Investments In Subsidiary Number Of Shares Outstanding 265,000        
Working Capital Note Convertible To Equity   $ 300      
Investment Owned at fair value write off $ 1,400        
Working Capital Note Convertible To Equity write off $ 300        
Warrant [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Warrants and Rights Outstanding, Term 10 years        
Binomial Lattice Model [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Risk free rate   1.28%      
Strike price   $ 11.50      
Binomial Lattice Model [Member] | Warrant [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Business Acquisition, Share Price   1.06      
Ghaidarov Model [Member] | Warrant [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Business Acquisition, Share Price   1.07      
Private Units [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Share Price   $ 10.65