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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating activities from continuing operations:    
Net loss $ (32,479) $ (87,495)
Adjustments to reconcile net loss to cash provided by operating activities:    
Depreciation and amortization 10,117 11,876
Loss on asset disposals, abandonments and write-downs 64 438
Provision for expected credit losses 1,048  
Deferred income taxes 134 133
Stock-based compensation expense 8,283 6,731
Amortization of deferred financing costs 4,355 3,901
Accretion and amortization of debt discount and premium 10,311 11,490
Loss on extinguishment of debt   57,962
Changes in operating assets and liabilities:    
Accounts receivable 8,619 (6,986)
Inventories 98 5,019
Prepaid expenses and other current assets 1,487 715
Contract assets (7,581) (567)
Accounts payable 577 2,425
Accrued liabilities (11,364) (1,835)
Deferred revenue 277 (186)
Accrued interest 26,379 (1,993)
Warranty reserves (450) 700
Right-of-use assets and operating lease liabilities (924) (1,065)
Other non-current assets and liabilities 1,364 158
Net cash provided by operating activities from continuing operations 20,315 1,421
Investing activities from continuing operations:    
Purchases of property and equipment (448) (1,091)
Acquisition of intangible assets—capitalized software (5,915) (4,229)
Redemptions of short—term investments   39,323
Net cash provided by (used in) investing activities from continuing operations (6,363) 34,003
Financing activities from continuing operations:    
Proceeds from credit facility draw 26,000  
Repayments of amounts drawn from credit facility (6,000)  
Repurchase of convertible notes (2,498) (159,502)
Proceeds from issuance of senior secured notes   920,683
Redemption of senior secured notes   (741,360)
Payment of debt issuance costs   (23,409)
Other financing activities (1,461) 88
Net cash provided by (used in) financing activities from continuing operations 16,041 (3,500)
Cash provided by (used in) operating activities (56,009) 73,917
Cash used in investing activities (28,152) (70,403)
Cash used in financing activities (344) (576)
Net cash provided by (used in) discontinued operations (84,505) 2,938
Effect of exchange rate changes on cash (19) (357)
Increase (decrease) in cash, cash equivalents and restricted cash (54,531) 34,505
Cash, cash equivalents and restricted cash at beginning of period 177,675 191,116
Cash, cash equivalents and restricted cash at end of period 123,144 225,621
Less: current restricted cash 560 535
Less: non-current restricted cash 5,101 7,424
Cash and cash equivalents at end of period 117,483 217,662
Supplemental Cash Flow Information:    
Cash paid for interest 53,230 86,477
Cash paid for taxes $ 311 $ 456