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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Cash Flows [Abstract]      
Net loss $ (52,294) $ (39,229) $ (43,413)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 8,323 7,408 8,949
Amortization of acquisition-related inventory step-up 4,097 0 0
Provision for bad debts, net of recoveries 422 86 1,936
Provision for excess and obsolete inventory 1,043 3,382 4,344
Share-based compensation expense 6,350 3,588 3,443
Amortization of debt discount and debt issuance costs 4,692 0 0
Change in fair value of warrant liability 0 3,280 0
Non-cash change in acquisition-related escrow 8,286 0 0
Shareholder litigation loss 0 0 14,326
Deferred income taxes 106 87 220
Unrealized foreign currency transaction gain (1,298) 0 0
Other 175 0 418
Changes in assets and liabilities, net of effects from acquisitions:      
Accounts receivable 4,760 15,688 730
Inventories (3,960) (13,392) 6,879
Prepaid expenses and other assets 2,683 (2,403) (489)
Accounts payable (11,187) 10,036 (19,237)
Accrued expenses, income taxes, and other 866 (4,798) (4,733)
Net cash used in operating activities (26,936) (16,267) (26,627)
Cash flows from investing activities:      
Acquisition-related escrow (8,275) 0 0
Acquisitions, net of cash acquired (85,991) 0 0
Purchases of property, plant and equipment (1,975) (1,753) (5,011)
Proceeds from the sale of property, plant and equipment 46 0 0
Purchases of intangible assets (1,157) (431) 0
Proceeds from the sale of short-term investments 265 0 0
Purchases of marketable securities 0 (1,359) (24,262)
Marketable securities maturities / sales 0 23,975 40,897
Net cash provided by (used in) investing activities (97,087) 20,432 11,624
Cash flows from financing activities:      
Gross proceeds from the issuance of convertible senior notes 120,000 0 0
Payment of issuance costs related to convertible senior notes (3,927) 0 0
Proceeds from the exercise of warrant to purchase common stock 8,644 0 0
Net borrowings on DigiCore bank facilities 1,581 0 0
Net borrowings (repayments) on revolving credit facility (5,158) 5,158 0
Payoff of acquisition-related assumed liabilities (2,633) 0 0
Principal payments under capital lease obligations (288) 0 0
Principal payments on mortgage bond (59) 0 0
Proceeds from the issuance of Series C preferred stock and common stock, net of issuance costs 0 14,163 0
Proceeds from the issuance of short-term debt, net of issuance costs 0 0 20,300
Principal repayments of short-term debt 0 (2,566) (17,734)
Repayment of litigation settlement note payable, including interest 0 (5,026) 0
Proceeds from stock option exercises and ESPP, net of taxes paid on vested restricted stock units 1,007 (821) (552)
Net cash provided by financing activities 119,167 10,908 2,014
Effect of exchange rates on cash and cash equivalents (427) (131) (144)
Net increase (decrease) in cash and cash equivalents (5,283) 14,942 (13,133)
Cash and cash equivalents, beginning of period 17,853 2,911 16,044
Cash and cash equivalents, end of period 12,570 17,853 2,911
Cash paid during the year for:      
Interest 3,640 119 65
Income taxes 139 108 121
Supplemental disclosures of non-cash activities:      
Issuance of common stock for litigation settlement 0 5,000 0
Initial fair value of warrant liability recorded upon issuance of Series C preferred and common stock 0 4,939 0
Issuance of common stock for conversion of Series C preferred stock $ 0 $ 940 $ 0