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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (2,990) $ (4,201)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 349 263
Stock-based compensation 636 313
Changes in assets and liabilities:    
Accounts receivable 311 90
Unbilled receivables (638) 1,297
Prepaid expenses and other current assets 223 (9)
Long-term tax receivable   (691)
Accounts payable (228) 97
Accrued expenses   773
Deferred revenue (985) 124
Net cash used in operating activities (3,322) (1,944)
Cash flows from investing activities:    
Purchases of property and equipment (21) (352)
Net cash used in investing activities (21) (352)
Cash flows from financing activities:    
Processed from issuance of common stock 24 24
Payments made for taxes of employees who surrendered shares related to unrestricted stock (54) (50)
Repurchase of common stock   (469)
Net cash used in financing activities (30) (495)
Decrease in cash and cash equivalents (3,373) (2,791)
Cash and cash equivalents, beginning of period 38,565 47,742
Cash and cash equivalents, end of period $ 35,192 $ 44,951