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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Cash Flows [Abstract]      
Net loss $ (60,568) $ (52,294) $ (39,229)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 14,053 8,323 7,408
Amortization of acquisition-related inventory step-up 1,829 4,097 0
Impairment of purchased intangible assets 2,594 0 0
Provision for bad debts, net of recoveries 1,136 422 86
Loss on impairment of abandoned product line 11,540 0 0
Provision for excess and obsolete inventory 3,257 1,043 3,382
Share-based compensation expense 4,588 6,350 3,588
Amortization of debt discount and debt issuance costs 8,447 4,692 0
Gain on divestiture and sale of other assets, net of loss on disposal of assets (4,742) (50) 0
Change in fair value of warrant liability 0 0 3,280
Non-cash change in acquisition-related escrow 0 8,286 0
Deferred income taxes 196 106 87
Non-cash equity earn-out compensation expense 7,913 0 0
Reversal of market development fund accrual (2,109) 0 0
Unrealized foreign currency transaction loss (gain), net 3,513 (1,298) 0
Other 270 225 0
Changes in assets and liabilities, net of effects from acquisitions and divestiture:      
Accounts receivable 11,616 4,760 15,688
Inventories (3,159) (3,960) (13,392)
Prepaid expenses and other assets 869 2,683 (2,403)
Accounts payable (7,825) (11,187) 10,036
Accrued expenses, income taxes, and other 3 866 (4,798)
Net cash used in operating activities (6,579) (26,936) (16,267)
Cash flows from investing activities:      
Acquisition-related escrow 0 (8,275) 0
Acquisitions, net of cash acquired (3,750) (85,991) 0
Purchases of property, plant and equipment (1,439) (1,975) (1,753)
Proceeds from the sale of property, plant and equipment 629 46 0
Proceeds from the sale of divested assets 11,300 0 0
Purchases of intangible assets and additions to capitalized software development costs (2,915) (1,157) (431)
Proceeds from the sale of short-term investments 1,210 265 0
Purchases of marketable securities 0 0 (1,359)
Marketable securities maturities / sales 0 0 23,975
Net cash provided by (used in) investing activities 5,035 (97,087) 20,432
Cash flows from financing activities:      
Gross proceeds from the issuance of convertible senior notes 0 120,000 0
Payment of issuance costs related to convertible senior notes 0 (3,927) 0
Proceeds from the exercise of warrant to purchase common stock 0 8,644 0
Net borrowings from (repayments of) DigiCore bank facilities (840) 1,581 0
Net borrowings from (repayments of) revolving credit facility 0 (5,158) 5,158
Payoff of acquisition-related assumed liabilities 0 (2,633) 0
Principal payments under capital lease obligations (903) (288) 0
Principal payments on mortgage bond (240) (59) 0
Proceeds from the issuance of Series C preferred stock and common stock, net of issuance costs 0 0 14,163
Principal repayments of short-term debt 0 0 (2,566)
Repayment of litigation settlement note payable, including interest 0 0 (5,026)
Proceeds from stock option exercises and employee stock purchase plan, net of taxes paid on vested restricted stock units 692 1,007 (821)
Net cash provided by (used in) financing activities (1,291) 119,167 10,908
Effect of exchange rates on cash and cash equivalents 159 (427) (131)
Net decrease in cash and cash equivalents (2,676) (5,283) 14,942
Cash and cash equivalents, beginning of period 12,570 17,853 2,911
Cash and cash equivalents, end of period 9,894 12,570 17,853
Cash paid during the year for:      
Interest 7,137 3,640 119
Income taxes 115 139 108
Supplemental disclosures of non-cash activities:      
Transfer of inventories to rental assets 5,568 1,032 0
Issuance of common stock for litigation settlement 0 0 5,000
Initial fair value of warrant liability recorded upon issuance of Series C preferred and common stock 0 0 4,939
Issuance of common stock for conversion of Series C preferred stock $ 0 $ 0 $ 940