Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 5,793	$ 4,507
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,761	1,477
Non-cash operating lease cost	340	297
Goodwill impairment	18,144
Change in fair value of contingent consideration	(24,522)
Loss on disposal of fixed assets		721
Loss on impairment of intangible asset	318	281
Stock-based compensation expense	(207)	1,386
Deferred income taxes	550	(124)
Provision (recovery) for doubtful accounts	(15)
Provision for inventory	831	381
Amortization of acquisition related inventory step-up	2,081
Amortization of premium and accretion of discount on investments and cash equivalents		(363)
Changes in operating assets and liabilities:
Accounts receivable	2,004	2,489
Inventories	(3,632)	(1,617)
Prepaid expenses, other current and long-term assets	(445)	(182)
Accounts payable	421	496
Operating lease liabilities	(310)	(269)
Accrued expenses, other current and long-term liabilities	(3,233)	(1,928)
Income taxes	166	910
Net cash provided by operating activities	1,045	8,462
Cash flows from investing activities:
Acquisition of Parcus Medical and Arthrosurface, net of cash acquired	(92,983)
Proceeds from maturities of investments	14,990	58,094
Purchases of investments	(13,787)	(58,981)
Purchases of property and equipment	(723)	(1,030)
Net cash used in investing activities	(92,503)	(1,917)
Cash flows from financing activities:
Cash paid for tax withheld on vested restricted stock awards	(141)	(124)
Proceeds from exercises of equity awards		5
Net cash used in financing activities	(141)	(119)
Exchange rate impact on cash	(31)	46
Increase (decrease) in cash and cash equivalents	(91,630)	6,472
Cash and cash equivalents at beginning of period	157,463	89,042
Cash and cash equivalents at end of period	65,833	95,514
Supplemental disclosure of cash flow information:
Right-of-use assets obtained in exchange for operating lease liabilities as of January 1, 2019	544	497
Non-cash Investing Activities:
Purchases of property and equipment included in accounts payable and accrued expenses	55	246
Consideration for acquisitions included in accounts payable and accrued expenses	2,085
Acquisition related contingent consideration	69,076
Accounting Standards Update 2016-02 [Member]
Supplemental disclosure of cash flow information:
Right-of-use assets obtained in exchange for operating lease liabilities as of January 1, 2019		$ 24,110