Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net income	$ 14,202	$ 4,940
Adjustments to reconcile net income to net cash provided by operating activities:
Non-cash expense related to stock-based compensation	2,469	2,076
Provision for doubtful accounts		541
Provision for expiring inventory	34	0
Depreciation and amortization	493	519
Loss on disposal of fixed assets	1	2
Deferred income taxes	127	129
Changes in operating assets and liabilities:
Accounts receivable, net	3,911	1,827
Inventories	527	1,670
Prepaid expenses and other assets	348	(556)
Accounts payable	(2,529)	(2,962)
Accrued and other current liabilities	(346)	9,297
Deferred revenue	(140)	(596)
Other long-term liabilities	28	(52)
Net cash provided by operating activities	19,125	16,835
Investing activities:
Loans to third party (Note 4)		(7,250)
Purchases of property and equipment	(54)	(1,071)
Net cash used in investing activities	(54)	(8,321)
Financing activities:
Repurchase of common stock including commissions		(5,252)
(Payments of cost) proceeds related to issuances of common stock, net	(2,888)	3,425
Net cash used in financing activities	(2,888)	(1,827)
Effect of exchange rate changes on cash and cash equivalents	23	59
Net increase in cash and cash equivalents	16,206	6,746
Cash and cash equivalents, beginning of period	101,403	86,228
Cash and cash equivalents, end of period	117,609	$ 92,974
Supplemental disclosure of non-cash operating activities:
Release of restricted cash in escrow for SEC settlement	$ 12,826