CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 29,446	$ 6,220	$ (4,112)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation	1,799	1,197	637
Loss on fixed asset disposal	0	0	37
Amortization of intangible assets	933	928	1,054
Impairment of intangible assets	0	0	368
Amortization of debt discount and deferred financing costs	42	0	1,328
Share-based compensation	16,896	11,453	6,010
Change in deferred income taxes	(7,081)	0	0
Increase (decrease) in cash resulting from changes in:
Accounts receivable	(27,083)	(10,579)	(8,439)
Inventory	(2,327)	(1,252)	(858)
Prepaid expenses and other assets	(2,094)	(203)	(637)
Accounts payable	3,136	1,287	1,209
Accrued compensation	3,511	5,935	2,836
Accrued expenses	2,140	1,098	353
Accrued interest	0	0	(42)
Other liabilities	(511)	718	(28)
Net cash flows from operating activities	18,807	16,802	(284)
Cash flows from investing activities:
Purchases of equipment	(5,827)	(2,558)	(2,337)
Maturity (purchases) of fixed maturity securities	6,000	(9,000)	0
Patent application costs	(851)	(594)	(689)
Net cash flows from investing activities	(678)	(12,152)	(3,026)
Cash flows from financing activities:
Proceeds from exercise of stock options	4,629	2,470	1,981
Proceeds from exercise of warrants	46	1,113	2,108
Proceeds from public offering, net of expenses	0	0	36,602
Deferred financing costs	(504)	0	0
Stock repurchase	(40,279)	(5,612)	0
Principal payments of equipment leases	(117)	(117)	(57)
Net cash flows from financing activities	(36,225)	(2,146)	40,634
Net change in cash	(18,096)	2,504	37,324
Cash and cash equivalents, beginning of period	46,582	44,078	6,754
Cash and cash equivalents, end of period	$ 28,486	$ 46,582	$ 44,078