Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 13,828	$ 4,611
Adjustments to reconcile net income to net cash from operating activities:
Provision for doubtful accounts	20	261
Reserve for product returns	1,144	1,008
Amortization for patents and tooling	574	364
Amortization and depreciation	7,710	3,204
Amortization of debt issuance costs	47	54
Deferred income taxes	(2,833)	(539)
Change in fair value of contingent liability	0	(190)
Undistributed losses from equity investee	120	45
Stock-based compensation	3,228	1,794
Changes in operating assets and liabilities (net of business acquisitions):
Accounts receivable	(1,998)	(7,422)
Inventory	579	(2,978)
Other assets	(5,425)	(1,510)
Accounts payable, accrued expenses and other current liabilities	7,602	7,268
Deferred revenue	(495)	393
Other liabilities	635	1,577
Cash flows from operating activities	24,736	7,940
Cash flows used in investing activities:
Business acquisitions, net of cash acquired	(154,289)	0
Additions to property and equipment	(5,714)	(4,564)
Investment in cost method investee	0	(139)
Issuances of notes receivable	(4,000)	(73)
Repayments of notes receivable	0	2,441
Cash flows used in investing activities	(164,003)	(2,335)
Cash flows from financing activities:
Proceeds from credit facility	67,000	0
Repayments of credit facility	(1,000)	0
Payments of long-term consideration for business acquisitions	0	(217)
Repurchases of common stock	(2)	(9)
Issuances of common stock from equity-based plans	1,551	427
Cash flows from financing activities	67,549	201
Net (decrease) / increase in cash and cash equivalents	(71,718)	5,806
Cash and cash equivalents at beginning of the period	140,634	128,358
Cash and cash equivalents at end of the period	68,916	134,164
Supplemental disclosure of noncash investing and financing activities:
Cash not yet paid for business acquisitions	0	200
Assumed options from business acquisition	1,375	0
Contingent liability from business acquisition	0	40
Cash not yet paid for capital expenditures	$ 611	$ 345