Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Difference Between Benefit for Income Taxes and Federal Statutory Income Tax Rate (Detail)

v3.6.0.2
Income Taxes - Schedule of Difference Between Benefit for Income Taxes and Federal Statutory Income Tax Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Tax at federal statutory rate $ (24,369) $ (15,785) $ (8,982)
State taxes, net (747) 4,840 (822)
Non-deductible stock compensation 2,781 1,085 (148)
Research credits (1,424) (814) (320)
Change in valuation allowance 23,773 5,043 9,778
Other (28) (91) $ 494
Income tax benefit $ (14) $ (5,722)