Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 14,313	$ 31,903	$ 51,943
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes	152	(2,468)	17,289
Depreciation expense	2,131	1,155	932
Amortization expense	2,520	2,515	2,815
Stock-based compensation expense	21,998	19,082	15,429
Change in fair value of contingent consideration	0	(763)	(7,377)
Amortization of debt issuance costs	480	376	222
Asset impairment charge	0	2,704	7,235
Non-cash restructuring charge	0	5,769	0
Changes in operating assets and liabilities which provided (used) cash:
Accounts receivable	18,481	(12,665)	(11,627)
Inventories	1,739	(5,556)	(2,379)
Prepaid expenses and other current assets	(4,841)	4,838	1,993
Other assets	(599)	(570)	0
Accounts payable	(4,455)	(2,064)	(8,460)
Accrued expenses and other liabilities	4,067	8,128	(9,096)
Net cash provided by operating activities	55,986	52,384	58,919
Cash flows from investing activities:
Purchase of property and equipment	(777)	(133)	(4,436)
Payment for Ryanodex intangible asset	0	0	(750)
Net cash used in investing activities	(777)	(133)	(5,186)
Cash flows from financing activities:
Repurchases of common stock	(17,961)	(73,105)	(43,792)
Payment of contingent consideration	0	(15,000)	0
Proceeds from long-term debt	0	0	50,000
Payment of debt	(6,000)	(3,750)	(1,250)
Payment of debt financing costs	(326)	0	(1,192)
Payment of employee withholding tax upon vesting of stock-based awards	(198)	0	0
Payments for employee net option exercises	0	(4,877)	0
Proceeds from common stock option exercises	260	8,615	4,338
Net cash (used in) provided by financing activities	(24,225)	(88,117)	8,104
Net increase (decrease) in cash and cash equivalents	30,984	(35,866)	61,837
Cash and cash equivalents at beginning of period	78,791	114,657	52,820
Cash and cash equivalents at end of period	109,775	78,791	114,657
Cash paid during the period for:
Income taxes, net	6,673	2,281	10,542
Interest	2,478	2,084	651
Right-of-use asset obtained in exchange for lease obligation - lease amendment	$ 3,716	$ 0	$ 0