CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2018		33,705
Beginning balance at Dec. 31, 2018	$ 87,177	$ 34	$ 52,920	$ 34,223
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		29
Options exercised for cash	115		115
Stock based compensation	2,051
Shares issued on net settlement of stock options (in shares)		185
Shares issued on net settlement of stock options	0
Net loss	(9,903)			(9,903)
Ending balance (in shares) at Jun. 30, 2019		33,919
Ending balance at Jun. 30, 2019	79,440	$ 34	55,086	24,320
Beginning balance (in shares) at Mar. 31, 2019		33,891
Beginning balance at Mar. 31, 2019	82,831	$ 34	54,182	28,615
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		11
Options exercised for cash	48		48
Stock based compensation	856		856
Shares issued on net settlement of stock options (in shares)		17
Shares issued on net settlement of stock options	0
Net loss	(4,295)			(4,295)
Ending balance (in shares) at Jun. 30, 2019		33,919
Ending balance at Jun. 30, 2019	79,440	$ 34	55,086	24,320
Beginning balance (in shares) at Dec. 31, 2019		34,170
Beginning balance at Dec. 31, 2019	71,259	$ 34	56,708	14,517
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		10
Options exercised for cash	72		72
Stock based compensation	2,146		2,146
Shares issued on net settlement of stock options (in shares)		22
Shares issued on net settlement of stock options	0
Net loss	(6,641)			(6,641)
Ending balance (in shares) at Jun. 30, 2020		34,202
Ending balance at Jun. 30, 2020	66,836	$ 34	58,926	7,876
Beginning balance (in shares) at Mar. 31, 2020		34,184
Beginning balance at Mar. 31, 2020	70,429	$ 34	57,829	12,566
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation	1,097
Shares issued on net settlement of stock options (in shares)		18
Shares issued on net settlement of stock options	0
Net loss	(4,690)			(4,690)
Ending balance (in shares) at Jun. 30, 2020		34,202
Ending balance at Jun. 30, 2020	$ 66,836	$ 34	$ 58,926	$ 7,876