Share/Stock-Based Compensation - Summary of Employee and Nonemployee Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Mar. 10, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Issuable Under Options, Outstanding	629,848
Shares Issuable Under Options, Granted	731,779
Shares Issuable Under Options, Forfeited	(214,692)
Shares Issuable Under Options, Outstanding	1,146,935	629,848
Shares Issuable Under Options, Options vested and expected to vest	1,137,407		100,446
Shares Issuable Under Options, Options exercisable	390,033
Weighted Average Exercise Price, Outstanding	$ 4.55
Weighted Average Exercise Price, Granted	7.04
Weighted Average Exercise Price, Forfeited	7.19
Weighted Average Exercise Price, Outstanding	5.64	$ 4.55
Weighted Average Exercise Price, Options vested and expected to vest	5.66
Weighted Average Exercise Price, Options exercisable	$ 5.07
Weighted Average Remaining Contractual Term, Outstanding	8 years 7 months 21 days	9 years 3 months 15 days
Weighted Average Remaining Contractual Term, Options vested and expected to vest	8 years 7 months 21 days
Weighted Average Remaining Contractual Term, Options exercisable	8 years 4 months 6 days
Aggregate Intrinsic Value, Outstanding	$ 440	$ 2,833
Aggregate Intrinsic Value, Options vested and expected to vest	431
Aggregate Intrinsic Value, Options exercisable	$ 213