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v3.19.3.a.u2

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash and cash equivalents balance outside of FDIC limit |  | $ 35,224 |  |
Right-of-use assets recorded |  | 3,786 |  |
Lease liabilities recorded |  | 3,823 |  |
Derecognition of capital lease assets | $ 96 |  |  |
Derecognition of capital lease liabilities | 63 |  |  |
Derecognition of deferred rent | $ 70 |  |  |
Restricted cash |  | 6,000 | $ 6,000 |
Accounts receivable, allowance for doubtful accounts |  | $ 1,092 | $ 1,117 |
Anti-dilutive securities excluded from computation of net loss per share |  | 1,556,818 | 2,621,440 | 2,253,399
Research and development |  | $ 17,514 | $ 11,773 | $ 6,699
Share-based compensation |  | $ 10,304 | $ 7,606 | $ 3,609
Minimum |  |  |  |
Age of doubtful accounts |  | 30 days |  |
Maximum |  |  |  |
Age of doubtful accounts |  | 60 days |  |

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