Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net income (loss)	$ 7,751	$ (6,726)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	2,298	2,299
Deferred taxes	97	334
Stock-based compensation expense	3,055	2,182
Provision for excess and obsolete inventory	537	244
Changes in operating assets & liabilities:
Accounts receivable	516	4,493
Inventories	(19,381)	(10,917)
Prepaid expenses and other current assets	(2,205)	(1,334)
Accounts payable and other current liabilities	21,213	(3,860)
Deferred revenue	1,671	(377)
Income taxes	104	13
Other assets and liabilities	(3,888)	1,794
Net cash provided by (used for) operating activities	11,768	(11,855)
Cash flows from investing activities
Expenditures for property, plant, and equipment	(672)	(567)
Net cash used for investing activities	(672)	(567)
Cash flows from financing activities
Decrease in restricted cash	760
Financing fees and other expenses	(847)
Principal payments on term loan	(14,530)
Principal payments on sale leaseback obligation	(392)
Proceeds from sale leaseback obligation	48,940
Proceeds from exercise of stock options	1,665	1,583
Proceeds from Employee Stock Purchase Plan	213	227
Net cash provided by financing activities	35,809	1,810
Effect of exchange rate changes on cash and cash equivalents	427	(90)
Net increase/(decrease) in cash and cash equivalents	47,332	(10,702)
Cash and cash equivalents at beginning of period	30,753	46,290
Cash and cash equivalents at end of period	$ 78,085	$ 35,588