Quarterly report pursuant to Section 13 or 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
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Prepaid expenses and other current assets $ 6,379 $ 5,290 $ 4,574    
Other non-current assets 1,869 2,030 910    
Total Assets 131,048 143,177 141,341    
Deferred revenue, net of current portion 59,734 56,780 53,303    
Total Liabilities 100,886 104,883 101,406    
Accumulated deficit (159,055) (148,707) (147,066)    
Total stockholders' equity 30,162 38,294 39,935 $ 50,693 $ 11,522
Total liabilities and stockholders' equity $ 131,048 143,177 $ 141,341    
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