CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 11,974	$ 29,446	$ 6,220
Adjustments to reconcile net income to net cash from operating activities:
Depreciation	3,333	1,799	1,197
Amortization of intangible assets	2,127	933	928
Amortization of inventory fair value step-up	1,485	0	0
Amortization of deferred financing costs	181	42	0
Share-based compensation	17,818	16,896	11,453
Change in deferred income taxes	(594)	(7,081)	0
Increase (decrease) in cash, net of effects of acquisition, resulting from changes in:
Accounts receivable	(11,396)	(27,083)	(10,579)
Inventory	(2,837)	(2,327)	(1,252)
Prepaid expenses	(2,400)	(1,854)	(203)
Other current assets	(384)	(240)	0
Accounts payable	(3,665)	3,136	1,287
Accrued compensation	(2,669)	3,511	5,935
Accrued expenses	6,297	2,140	1,098
Income taxes	5,835	(519)	452
Other liabilities	723	8	266
Net cash flows from operating activities	25,828	18,807	16,802
Cash flows from investing activities:
Purchases of equipment	(6,269)	(5,827)	(2,558)
Purchase of Stability Inc., net of cash acquired	(7,631)	0	0
Fixed maturity securities redemption	3,000	6,000	(9,000)
Patent application costs	(842)	(851)	(594)
Net cash flows from investing activities	(11,742)	(678)	(12,152)
Cash flows from financing activities:
Proceeds from exercise of stock options	3,494	4,629	2,470
Proceeds from exercise of warrants	0	46	1,113
Stock repurchase under repurchase plan	(10,378)	(40,279)	(5,612)
Stock repurchase for tax withholdings on vesting of restricted stock	(1,165)	0	0
Deferred financing costs	(30)	(504)	0
Payments under capital lease obligations	(102)	(117)	(117)
Net cash flows from financing activities	(8,181)	(36,225)	(2,146)
Net change in cash	5,905	(18,096)	2,504
Cash and cash equivalents, beginning of period	28,486	46,582	44,078
Cash and cash equivalents, end of period	$ 34,391	$ 28,486	$ 46,582