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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net loss $ (137) $ (1,709)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 6,081 8,678
Operating lease cost 340  
Noncash compensation 370 235
Deferred income tax benefit   (33)
(Gain) loss on disposal of assets (44) 10
Remeasurement and other (153) 174
Change in current assets and liabilities:    
Increase in accounts receivable (10,291) (9,036)
Decrease (increase) in prepaid expenses and other current assets 3,503 (1,755)
Increase in accounts payable 2,606 2,845
Increase in accrued liabilities 1,270 1,826
Decrease in operating lease liabilities (286)  
Decrease in deferred revenue (4,826) (481)
Net cash (used in) provided by operating activities (1,567) 754
Cash flows from investing activities:    
Capital expenditures, net of noncash capital expenditures summarized below (1,944) (4,120)
Proceeds from maturity of short-term investments 9,000 11,000
Acquisition of short-term investments (9,000) (12,000)
Proceeds from disposal of assets 80 57
Proceeds from flood insurance claims   687
Proceeds from notes receivable 13  
Net cash used in investing activities (1,851) (4,376)
Cash flows from financing activities:    
Principal payments on notes payable (1,146) (27)
Principal payments on finance leases (700) (663)
Tax withholdings related to stock-based compensation awards (206) (23)
Net cash used in financing activities (2,052) (713)
Effect of exchange rate changes on cash and cash equivalents 146 (70)
Net decrease in cash and cash equivalents (5,324) (4,405)
Cash and cash equivalents at beginning of period 28,729 22,013
Cash and cash equivalents at end of period 23,405 17,608
Supplemental cash flow information:    
Cash paid for interest 144 74
Noncash investing and financing activities:    
(Decrease) increase in accrued purchases of property and equipment (938) 315
Finance leases incurred 40  
Increase in right-of-use assets and operating lease liabilities 8,337  
Decrease in right-of-use asset for accrued rent (497)  
Increase in right-of-use asset for prepaid rent 14  
Financed insurance premiums $ 337 $ 304