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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net loss $ (45,840) $ (60,568) $ (52,294)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 14,274 14,053 8,323
Amortization of acquisition-related inventory step-up 0 1,829 4,097
Impairment of purchased intangible assets 0 2,594 0
Provision for bad debts, net of recoveries 1,618 1,136 422
Loss on impairment of abandoned product line, net of recoveries 815 11,540 0
Provision for excess and obsolete inventory 1,674 3,257 1,043
Share-based compensation expense 3,748 4,588 6,350
Amortization of debt discount and debt issuance costs 10,283 8,447 4,692
Loss on extinguishment of debt 2,035 0 0
Loss on disposal of assets, net of gain on divestiture and sale of other assets 804 (4,742) (50)
Non-cash change in acquisition-related escrow 0 0 8,286
Deferred income taxes 319 196 106
Non-cash equity earn-out compensation expense 0 7,913 0
Reversal of market development fund accrual 0 (2,109) 0
Unrealized foreign currency transaction loss (gain), net (316) 3,513 (1,298)
Other 65 270 225
Changes in assets and liabilities, net of effects from divestiture:      
Restricted cash (61) 0 0
Accounts receivable 5,638 11,616 4,760
Inventories 3,020 (3,159) (3,960)
Prepaid expenses and other assets (3,239) 869 2,683
Accounts payable (730) (7,825) (11,187)
Accrued expenses, income taxes, and other (8,744) 3 866
Net cash used in operating activities (14,637) (6,579) (26,936)
Cash flows from investing activities:      
Acquisition-related escrow 0 0 (8,275)
Installment payments related to past acquisitions 0 (3,750) (85,991)
Purchases of property, plant and equipment (1,789) (1,439) (1,975)
Proceeds from the sale of property, plant and equipment 253 629 46
Proceeds from the sale of divested assets 0 11,300 0
Purchases of intangible assets and additions to capitalized software development costs (2,839) (2,915) (1,157)
Proceeds from the sale of short-term investments 0 1,210 265
Net cash provided by (used in) investing activities (4,375) 5,035 (97,087)
Cash flows from financing activities:      
Proceeds from term loans 64,917 0 0
Payment of issuance costs related to term loans (905) 0 0
Principal repayments of short-term debt (20,000) 0 0
Gross proceeds from the issuance of convertible senior notes 0 0 120,000
Payment of issuance costs related to convertible senior notes 0 0 3,927
Repurchase of convertible senior notes 11,900 0 0
Proceeds from the exercise of warrant to purchase common stock 0 0 8,644
Net borrowings from (repayment of) DigiCore bank and overdraft facilities (76) (840) 1,581
Net repayments of revolving credit facility 0 0 (5,158)
Payoff of acquisition-related assumed liabilities 0 0 (2,633)
Principal payments under capital lease obligations (876) (903) (288)
Principal payments on mortgage bond (288) (240) (59)
Taxes paid on vested restricted stock units, net of proceeds from stock option exercises and employee stock purchase plan (506) 692 1,007
Net cash provided by (used in) financing activities 30,366 (1,291) 119,167
Effect of exchange rates on cash and cash equivalents (50) 159 (427)
Net increase (decrease) in cash and cash equivalents 11,304 (2,676) (5,283)
Cash and cash equivalents, beginning of period 9,894 12,570 17,853
Cash and cash equivalents, end of period 21,198 9,894 12,570
Cash paid during the year for:      
Interest 9,074 7,137 3,640
Income taxes 440 115 139
Supplemental disclosures of non-cash activities:      
Transfer of inventories to rental assets 5,943 5,568 1,032
Issuance of common stock under amended earn-out agreement 2,638 0 0
Additional debt discount on exchange of convertible senior notes 3,600 0 0
Term loan debt discount issued in common stock $ 2,340 $ 0 $ 0