CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 29,853	$ 6,493
Adjustments to reconcile net income to net cash from operating activities:
Depreciation	3,074	2,394
Amortization of intangible assets	1,451	1,889
Amortization of inventory fair value step-up	203	1,471
Amortization of deferred financing costs	135	136
Impairment of intangible assets	357	0
Share-based compensation	15,232	13,826
Change in deferred income taxes	(8,557)	(449)
Gain on divestiture	(4,274)	0
Increase (decrease) in cash, net of effects of acquisition and divestiture, resulting from changes in:
Accounts receivable	5,165	(7,671)
Inventory	3,738	(3,599)
Prepaid expenses	(792)	(2,023)
Other assets	(402)	286
Accounts payable	478	(3,941)
Accrued compensation	2,873	(4,223)
Accrued expenses	(2,228)	2,020
Income taxes	(3,438)	2,621
Other liabilities	(794)	(82)
Net cash flows from operating activities	42,074	9,148
Cash flows from investing activities:
Purchases of equipment	(3,998)	(5,301)
Stability acquisition	0	(7,631)
Fixed maturity securities redemption	0	3,000
Patent application costs	(144)	(515)
Net cash flows from investing activities	(4,142)	(10,447)
Cash flows from financing activities:
Proceeds from exercise of stock options	11,590	2,548
Share repurchase under repurchase plan	(44,032)	(10,378)
Share repurchase for tax withholdings on vesting of restricted stock	(3,337)	(892)
Deferred financing costs	0	(106)
Payments under capital lease obligations	(22)	(21)
Net cash flows from financing activities	(35,801)	(8,849)
Net change in cash	2,131	(10,148)
Cash and cash equivalents, beginning of period	34,391	28,486
Cash and cash equivalents, end of period	$ 36,522	$ 18,338