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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities    
Net loss $ (9,977) $ (12,481)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 3,323 3,422
Non-cash interest and other expense 3,994 1,984
Stock-based compensation expense 7,124 5,271
Provision for bad debts 295 655
Other 0 139
Changes in operating assets and liabilities:    
Accounts receivable (12,146) 2,306
Inventories 1,175 (2,649)
Prepaid expenses and other assets (1,421) (462)
Accounts payable, accrued expenses and other current liabilities (14,226) (8,776)
Deferred revenue (87) (882)
Other long-term liabilities 111 956
Net cash provided by (used in) operating activities [1] (21,835) (10,517)
Cash flows from investing activities    
Purchases of property, equipment and software [2] (25,679) (3,160)
Purchases of short-term investments (41,347) 0
Receipts from the maturity or sale of short-term investments 24,740 0
Proceeds from divestiture of business, net 0 4,614
Net cash (used in) provided by investing activities (42,286) 1,454
Cash flows from financing activities    
Principal payments of capital lease obligations (269) (1,340)
Proceeds from exercise of stock options 6,335 796
Payment of withholding taxes in connection with vesting of restricted stock units (3,139) (1,640)
Net cash provided by (used in) financing activities 2,927 (2,184)
Effect of exchange rate changes on cash 58 210
Net decrease in cash and cash equivalents (61,136) (11,037)
Cash and cash equivalents, beginning of period 137,174 122,672
Cash and cash equivalents, end of period 76,038 $ 111,635
Purchases of property, equipment and software, previously recorded in accounts payable $ 1,700  
[1] Includes 2016 activity related to discontinued operations. See note 3 to the consolidated financial statements for discussion of discontinued operations.
[2] Cash outflows from purchases of property, equipment and software for the three months ended March 31, 2017 includes $1.7 million of purchases made in prior periods that were previously included in accounts payable.