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Income Taxes - Schedule of Effective Income Tax Amount Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]                      
U.S. federal tax at statutory rate                 $ (4,014) $ (8,764) $ (12,818)
U.S. state income taxes                 490 (756) (1,098)
Non-deductible expenses                 931 438 420
Research and development credit                 (262) (440) (455)
Stock-based compensation                 983 737 746
Other                 (104) 481 (72)
Change in valuation allowance                 2,030 8,365 13,362
Total provision for income taxes $ (14) $ (2) $ 42 $ 28 $ 13 $ 50 $ (20) $ 18 $ 54 $ 61 $ 85