Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Consolidated Balance Sheet Data (Details)

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Summary of Significant Accounting Policies - Consolidated Balance Sheet Data (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Prepaid expenses and other current assets $ 4,072 $ 5,290 $ 4,574  
Other non-current assets 3,146 2,030 910  
Total Assets 141,097 143,177 141,341  
Deferred revenue, net of current portion 47,258 56,780 53,303  
Total Liabilities 89,745 104,883 101,406  
Accumulated deficit (174,176) (148,707) (147,066)  
Total stockholders' equity 51,352 38,294 39,935 $ 11,522
Total liabilities and stockholders' equity 141,097 143,177 141,341  
Operating lease right-of-use assets 3,436 868 0  
Deferred rent   0 35  
Current operating lease liabilities 733 442 0  
Non-current operating lease liabilities $ 15,484 461 $ 0  
Accounting Standards Update 2016-02 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Operating lease right-of-use assets   868    
Deferred rent   (35)    
Current operating lease liabilities   442    
Non-current operating lease liabilities   461    
Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Prepaid expenses and other current assets   716    
Other non-current assets   1,120    
Total Assets   1,836    
Deferred revenue, net of current portion   3,477    
Total Liabilities   3,477    
Accumulated deficit   (1,641)    
Total stockholders' equity   (1,641)    
Total liabilities and stockholders' equity   $ 1,836