XML 98 R76.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income Taxes - Schedule of Effective Income Tax Amount Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                      
U.S. federal tax at statutory rate                 $ (2,958) $ (4,014) $ (8,764)
U.S. state income taxes                 (708) 490 (756)
Non-deductible expense (benefit)                 (5,673) 931 438
Research and development credit                 (402) (262) (440)
Stock-based compensation                 (14,622) 983 737
Impact of 2017 Tax Act                 25,952 0 0
Other                 2 (104) 481
Change in valuation allowance                 (1,323) 2,030 8,365
Total provision for income taxes $ 126 $ 43 $ 50 $ 49 $ (14) $ (2) $ 42 $ 28 $ 268 $ 54 $ 61