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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (37,893) $ (35,228)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 4,484 5,889
Provision for bad debts, net of recoveries 62 187
Provision for excess and obsolete inventory 810 3,033
Share-based compensation expense 3,227 1,616
Amortization of debt discount and debt issuance costs 2,581 0
Change in fair value of warrant liability 0 4,788
Non-cash change in acquisition-related escrow 10,317 0
Changes in assets and liabilities, net of effects from acquisition:    
Accounts receivable (6,664) 11,600
Inventories 6,804 (3,379)
Prepaid expenses and other assets (574) 1,300
Accounts payable (13,868) 5,500
Accrued expenses, income taxes, and other 4,417 (4,790)
Net cash used in operating activities (26,297) (9,484)
Cash flows from investing activities:    
Acquisition-related escrow (88,274) 0
Acquisition, net of cash acquired (9,063) 0
Purchases of property and equipment (996) (1,513)
Purchases of intangible assets (224) (143)
Purchases of marketable securities 0 (1,255)
Marketable securities maturities / sales 0 18,513
Net cash provided by (used in) investing activities (98,557) 15,602
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
Proceeds from the issuance of Series C preferred stock and common stock, net of issuance costs 0 14,163
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 257 (375)
Net cash provided by financing activities 117,570 11,222
Effect of exchange rates on cash and cash equivalents (350) (88)
Net increase (decrease) in cash and cash equivalents (7,634) 17,252
Cash and cash equivalents, beginning of period 17,853 2,911
Cash and cash equivalents, end of period 10,219 20,163
Cash paid during the year for:    
Interest 110 80
Income taxes 123 83
Supplemental disclosures of non-cash financing activities:    
Issuance of common stock for settlement of shareholder litigation 0 5,000
Initial fair value of warrant liability recorded upon issuance of Series C preferred stock and common stock $ 0 $ 4,939