Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2014
Deferred tax assets:
Net operating loss carryforwards	$ 30,275	$ 19,510
Amortization	11,602	6,830
Stock based compensation	3,577	4,587
Accounts receivable	53	0
Fair value contingent consideration	264	384
Restructuring costs (Noctiva)	0	13,812
Other	901	479
Gross deferred tax assets	46,672	45,602
Deferred tax liabilities:
Amortization	(172)	(308)
Accounts receivable	0	(661)
Prepaid expenses	(35)	(405)
Gross deferred tax liabilities	(207)	(1,374)
Less: valuation allowances	(17,038)	(21,199)
Net deferred tax assets	$ 29,427	$ 23,029	$ 10,342	$ 13,102