CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2018		33,705
Beginning balance at Dec. 31, 2018	$ 87,177	$ 34	$ 52,920	$ 34,223	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(14,273)			(14,273)
Options exercised (in shares)		51
Options exercised for cash	154		154
Stock based compensation	2,594		2,594
Shares issued on net settlement of stock options (in shares)		221
Shares issued on net settlement of stock options	0
Ending balance (in shares) at Sep. 30, 2019		33,977
Ending balance at Sep. 30, 2019	75,652	$ 34	55,668	19,950	0
Beginning balance (in shares) at Jun. 30, 2019		33,921
Beginning balance at Jun. 30, 2019	79,440	$ 34	55,086	24,320	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(4,370)			(4,370)
Options exercised (in shares)		21
Options exercised for cash	39		39
Stock based compensation	543		543
Shares issued on net settlement of stock options (in shares)		35
Shares issued on net settlement of stock options	0
Ending balance (in shares) at Sep. 30, 2019		33,977
Ending balance at Sep. 30, 2019	75,652	$ 34	55,668	19,950	0
Beginning balance (in shares) at Dec. 31, 2019		34,170
Beginning balance at Dec. 31, 2019	71,259	$ 34	56,708	14,517	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(10,375)			(10,369)	(6)
Contributions from non-controlling interest	148				148
Options exercised (in shares)		20
Options exercised for cash	97		97
Stock based compensation	3,209		3,209
Shares issued on net settlement of stock options (in shares)		33
Shares issued on net settlement of stock options	0
Ending balance (in shares) at Sep. 30, 2020		34,223
Ending balance at Sep. 30, 2020	64,338	$ 34	60,014	4,148	142
Beginning balance (in shares) at Jun. 30, 2020		34,202
Beginning balance at Jun. 30, 2020	66,836	$ 34	58,926	7,876	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,734)			(3,728)	(6)
Contributions from non-controlling interest	148				148
Options exercised (in shares)		10
Options exercised for cash	25		25
Stock based compensation	1,063		1,063
Shares issued on net settlement of stock options (in shares)		11
Shares issued on net settlement of stock options	0
Ending balance (in shares) at Sep. 30, 2020		34,223
Ending balance at Sep. 30, 2020	$ 64,338	$ 34	$ 60,014	$ 4,148	$ 142