Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 02, 2018	Jan. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Stock-based compensation
Options Available for Grant, Outstanding, Beginning balance		83,929	83,929
Options Available for Grant, Options authorized			384,516
Options Available for Grant, RSUs granted			(36,350)
Options Available for Grant, RSUs cancelled/forfeited			400
Options Available for Grant, Options granted			(218,600)
Options Available for Grant, Options exercised		0
Options Available for Grant, Outstanding, Ending balance			212,869	83,929
Number of Options, Outstanding, Beginning balance		1,593,195	1,593,195
Number of Options, Options granted			218,600
Number of Options, Options exercised			(58,229)
Number of Options, Options cancelled/forfeited			(391)
Number of Options, Outstanding, Ending balance			1,766,959	1,593,195
Number of Options, exercisable			783,554
Weighted - Average Exercise Price Per Share, Options outstanding, Beginning balance		$ 8.88	$ 8.88
Weighted - Average Exercise Price Per Share, Options granted			9.12
Weighted - Average Exercise Price Per Share, Options exercised			5.31
Weighted - Average Exercise Price Per Share, Options cancelled/forfeited			6.63
Weighted - Average Exercise Price Per Share, Options outstanding, Ending balance		$ 16.25	7.04	$ 8.88
Weighted - Average Exercise Price Per Share, Options exercisable			$ 5.29
Weighted - Average Remaining Contractual Life, Options outstanding			7 years	6 years 7 months 6 days
Weighted - Average Remaining Contractual Life, Options exercisable			4 years
Aggregate Intrinsic Value, Options outstanding			$ 1,949	$ 1,997
Aggregate Intrinsic Value, Options exercised			200
Aggregate Intrinsic Value, Options exercisable			$ 1,803
Prior period adjustment
Stock-based compensation
Options Available for Grant, Outstanding, Ending balance	(1,026)
Number of Options, Outstanding, Ending balance	13,784
Weighted - Average Exercise Price Per Share, Options outstanding, Ending balance	$ 4.54
Weighted - Average Remaining Contractual Life, Options outstanding	3 months 18 days