Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Stock Option Activity (Detail)

v3.3.1.900
Stockholders' Equity - Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of shares, Options vested and expected to vest 2,164,365 2,164,365  
Number of shares, Options granted 1,500,000 0  
Number of shares, Options exercised   (100,000)  
Number of shares, Options cancelled   (285,000)  
Number of shares, Options vested and expected to vest   1,779,365 2,164,365
Number of shares, Options vested and exercisable   1,067,168  
Weighted Average Exercise Price, Options vested and expected to vest $ 4.69 $ 4.69  
Weighted Average Exercise Price, Options granted   0  
Weighted Average Exercise Price, Options exercised   2.15  
Weighted Average Exercise Price, Options cancelled   7.57  
Weighted Average Exercise Price, Options vested and expected to vest   4.37 $ 4.69
Weighted Average Exercise Price, Options vested and exercisable   $ 3.69  
Total Weighted Average Intrinsic Value, Options vested and expected to vest $ 0 $ 0  
Total Weighted Average Intrinsic Value, Options granted   0  
Total Weighted Average Intrinsic Value, Options exercised   64,000  
Total Weighted Average Intrinsic Value, Options cancelled   42,200  
Total Weighted Average Intrinsic Value, Options vested and expected to vest   666,396 $ 0
Total Weighted Average Intrinsic Value, Options vested and exercisable   $ 633,046  
Weighted Average Remaining Contractual Life, Options vested and expected to vest   6 years 3 months 25 days 7 years 4 months 17 days
Weighted Average Remaining Contractual Life, Options vested and exercisable   5 years 10 months 6 days