v3.4.0.3
Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (4,911) $ (8,903)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,103 1,775
Provision for doubtful accounts 25 113
Stock-based compensation 1,994 2,235
Loss on disposal of property and equipment 1 10
Non-cash interest expense 91 84
Others (4) (1)
Changes in operating assets and liabilities:    
Accounts receivable (1,990) (510)
Prepaid expenses and other current assets (1,715) (1,211)
Other assets (30) (94)
Accounts payable 825 (1,629)
Accrued and other current liabilities 1,935 1,123
Accrued federal fees and sales tax liability 93 960
Deferred revenue 1,659 286
Other liabilities (24) 9
Net cash provided by (used in) operating activities 52 (5,753)
Cash flows from investing activities:    
Purchases of property and equipment (252) (198)
Decrease in restricted cash 0 660
Purchase of short-term investments 0 (20,000)
Proceeds from maturity of short-term investments 0 20,000
Net cash (used in) provided by investing activities (252) 462
Cash flows from financing activities:    
Proceeds from exercise of common stock options 2,397 116
Repayments of notes payable (1,608) (781)
Payments of capital leases (1,306) (1,687)
Net cash used in financing activities (517) (2,352)
Net decrease in cash and cash equivalents (717) (7,643)
Cash and cash equivalents:    
Beginning of period 58,484 58,289
End of period 57,767 50,646
Non-cash investing and financing activities:    
Equipment obtained under capital lease 1,307 1,309
Equipment purchased and unpaid at period-end $ 137 $ 16