Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (7,826)	$ (8,981)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	1,247	2,125
Provision for bad debts, net of recoveries	(41)	30
Provision for excess and obsolete inventory	206	180
Share-based compensation expense	790	477
Non-cash income tax benefit	0	(6)
Changes in assets and liabilities, net of effects from acquisition:
Accounts receivable	(6,111)	9,928
Inventories	1,449	2,484
Prepaid expenses and other assets	1,152	2,418
Accounts payable	(3,601)	(1,175)
Accrued expenses, income taxes, and other	5,602	(2,085)
Net cash provided by (used in) operating activities	(7,133)	5,395
Cash flows from investing activities:
Acquisition, net of cash acquired	(9,063)	0
Purchases of property and equipment	(111)	(513)
Purchases of intangible assets	(224)	0
Marketable securities maturities / sales	0	6,564
Net cash provided by (used in) investing activities	(9,398)	6,051
Cash flows from financing activities:
Proceeds from the exercise of warrant to purchase common stock	8,644	0
Borrowings on revolving credit facility	2,000	0
Payoff of acquisition-related assumed liabilities	(2,633)
Principal repayments of short-term debt	0	(2,268)
Proceeds from stock option exercises and ESPP, net of taxes paid on vested restricted stock units	66	(217)
Net cash provided by (used in) financing activities	8,077	(2,485)
Effect of exchange rates on cash and cash equivalents	(29)	(45)
Net increase (decrease) in cash and cash equivalents	(8,483)	8,916
Cash and cash equivalents, beginning of period	17,853	2,911
Cash and cash equivalents, end of period	9,370	11,827
Cash paid during the year for:
Interest	36	6
Income taxes	$ 2	$ 64