Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (8,627,000)	$ 11,989,000	$ 14,313,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income taxes	(3,618,000)	(1,511,000)	152,000
Depreciation expense	764,000	872,000	972,000
Noncash operating lease expense related to right-of-use assets	1,046,000	1,228,000	1,159,000
Amortization expense of intangible assets	2,996,000	2,666,000	2,520,000
Convertible promissory note related credit losses	758,000	0	0
Stock-based compensation expense	19,555,000	24,756,000	21,998,000
Fair value adjustments on equity investment	6,170,000	5,300,000	0
Amortization of debt issuance costs	472,000	419,000	480,000
Fair value adjustments on settled accelerated share repurchase agreement	0	2,962,000	0
Fair value adjustments related to derivative instrument	(686,000)	0	0
Accretion of discount on convertible promissory note	(148,000)	0	0
Changes in operating assets and liabilities which provided (used) cash:
Accounts receivable	9,529,000	(3,113,000)	18,481,000
Inventories	(13,833,000)	(1,509,000)	1,739,000
Prepaid expenses and other current assets	(2,770,000)	11,386,000	(4,841,000)
Other assets	(1,321,000)	(2,325,000)	(599,000)
Accounts payable	10,162,000	806,000	(4,455,000)
Accrued expenses and other liabilities	7,770,000	(4,429,000)	4,067,000
Net cash provided by operating activities	28,219,000	49,497,000	55,986,000
Cash flows from investing activities:
Purchase of equity investment security	0	(17,500,000)	0
Purchase of property and equipment	(323,000)	(747,000)	(777,000)
Purchase of convertible promissory note	(5,000,000)	0	0
Net cash used in investing activities	(5,323,000)	(18,247,000)	(777,000)
Cash flows from financing activities:
Repurchases of common stock	(21,213,000)	(34,999,000)	(17,961,000)
Proceeds from existing revolving credit facility	0	110,000,000	0
Repayment of existing revolving credit facility	0	(110,000,000)	0
Payment of debt	(8,000,000)	(5,000,000)	(6,000,000)
Payment of debt financing costs	0	0	(326,000)
Payment of employee withholding tax upon vesting of stock-based awards	(1,577,000)	(1,525,000)	(198,000)
Proceeds from common stock option exercises	2,398,000	3,654,000	260,000
Net cash used in financing activities	(28,392,000)	(37,870,000)	(24,225,000)
Net (decrease) increase in cash and cash equivalents	(5,496,000)	(6,620,000)	30,984,000
Cash and cash equivalents at beginning of period	103,155,000	109,775,000	78,791,000
Cash and cash equivalents at end of period	97,659,000	103,155,000	109,775,000
Cash paid during the period for:
Income taxes, net	10,005,000	6,428,000	6,673,000
Interest	1,197,000	2,224,000	2,478,000
Right-of-use asset obtained in exchange for lease obligation, inclusive of a lease amendment	$ 270,000	$ 855,000	$ 3,716,000