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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 $ (82,955) $ (72,314) $ (15,661)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Amortization of intangibles 8,322 [1] 14,836 6,502
Depreciation 14,599 18,819 13,241
Stock-based compensation 16,610 13,060 15,582
Amortization of discount on convertible debt 5,489 4,964 216
Provision for non-cash warrant 153 434  
Restructuring, asset impairment and loss on retirement of fixed assets 1,906 2,305 641
Loss on impairment of long-term investment 530 2,735 2,505
Unrealized foreign exchange (gain) loss 2,369 (856) (1,047)
Gain on pension curtailment 0 (1,955)  
Deferred income taxes, net 2,189 (10,085) (512)
Provision for doubtful accounts, returns and discounts 4,912 2,589 2,034
Provision for excess and obsolete inventories 6,005 6,871 1,585
Other non-cash adjustments, net 445 408 0
Changes in operating assets and liabilities, net of effects of acquisition:      
Accounts receivable 12,598 (2,563) 2,595
Inventories 11,687 (4,107) (5,954)
Prepaid expenses and other assets 6,642 (1,892) (8,206)
Accounts payable 3,432 5,793 4,683
Deferred revenues (392) 18,106 (4,541)
Income taxes payable (2,978) (133) (1,637)
Accrued and other liabilities (8,499) 3,423 (5,675)
Net cash provided by operating activities 3,064 438 6,351
Cash flows from investing activities:      
Acquisition of business, net of cash acquired 0 (75,669)  
Purchases of investments 0 0 (25,261)
Proceeds from maturities of investments 3,106 19,707 30,379
Proceeds from sales of investments 3,792 0 0
Purchases of property and equipment (11,399) (15,107) (14,356)
Purchases of long-term investments 0 0 (85)
Decrease (increase) in restricted cash 288 591 (1,091)
Net cash used in investing activities (4,213) (70,478) (10,414)
Cash flows from financing activities:      
Proceeds from convertible debt 0 0 128,250
Payment of convertible debt issuance cost 0 (582) (3,527)
Proceeds from other debts 6,344 5,968  
Repayment of other debts and capital leases (7,408) (8,338)  
Proceeds from common stock issued to employees 4,716 4,444 9,222
Payment of tax withholding obligations related to net share settlements of restricted stock units (2,757) (1,644) (3,549)
Payments for repurchases of common stock 0 0 (72,863)
Net cash provided by (used in) financing activities 895 (152) 57,533
Effect of exchange rate changes on cash and cash equivalents 1,643 (363) (312)
Net increase (decrease) in cash and cash equivalents 1,389 (70,555) 53,158
Cash and cash equivalents at beginning of period 55,635 126,190 73,032
Cash and cash equivalents at end of period 57,024 55,635 126,190
Supplemental disclosures of cash flow information:      
Income tax payments (refunds), net 2,141 (54) 952
Interest payments, net 5,515 5,275  
Supplemental schedule of non-cash investing and financing activities:      
Capital expenditures incurred but not yet paid 337 394 235
Debt issuance costs incurred but not yet paid $ 0 $ 0 $ 582
[1] For the years ended December 31, 2017 and 2016, the unallocated corporate expenses included TVN acquisition- and integration-related costs, TVN VDP costs (see Note 10, “Restructuring and Related charges-TVN VDP,” for more information on TVN VDP ) and Cable Edge product line inventory obsolescence costs, totaling $7.9 million and $32.2 million, respectively. In addition, in fiscal year 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 19, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.