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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net loss $ (17,046) $ (26,396)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,979 4,041
Provision for bad debts, net of recoveries (43) 109
Provision for excess and obsolete inventory 299 3,033
Share-based compensation expense 1,973 1,239
Amortization of debt discount and debt issuance costs 469 0
Changes in assets and liabilities, net of effects from acquisition:    
Accounts receivable (5,832) 14,241
Inventories 7,904 (1,262)
Prepaid expenses and other assets 765 2,170
Accounts payable (14,916) 2,487
Accrued expenses, income taxes, and other 4,268 1,375
Net cash provided by (used in) operating activities (19,180) 1,037
Cash flows from investing activities:    
Acquisition-related escrow (88,274) 0
Acquisition, net of cash acquired (9,063) 0
Purchases of property and equipment (613) (1,241)
Purchases of intangible assets (224) 0
Purchases of marketable securities 0 (826)
Marketable securities maturities / sales 0 9,945
Net cash provided by (used in) investing activities (98,174) 7,878
Cash flows from financing activities:    
Gross proceeds from the issuance of convertible senior notes 120,000 0
Payment of issuance costs related to convertible senior notes (3,540) 0
Proceeds from the exercise of warrant to purchase common stock 8,644 0
Net repayments on revolving credit facility (5,158) 0
Payoff of acquisition-related assumed liabilities (2,633) 0
Principal repayments of short-term debt 0 (2,566)
Proceeds from stock option exercises and ESPP, net of taxes paid on vested restricted stock units 315 (284)
Net cash provided by (used in) financing activities 117,628 (2,850)
Effect of exchange rates on cash and cash equivalents (214) (51)
Net increase in cash and cash equivalents 60 6,014
Cash and cash equivalents, beginning of period 17,853 2,911
Cash and cash equivalents, end of period 17,913 8,925
Cash paid during the year for:    
Interest 106 6
Income taxes $ 106 $ 67