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Stockholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Jul. 14, 2020
Aug. 31, 2020
USD ($)
$ / shares
shares
Jan. 31, 2020
shares
Sep. 30, 2020
USD ($)
item
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
item
$ / shares
shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2019
$ / shares
shares
Sep. 30, 2020
USD ($)
item
$ / shares
shares
Aug. 04, 2020
shares
Jun. 30, 2020
USD ($)
Stockholders' Equity [Line Items]                          
Common stock, par value | $ / shares       $ 0.001   $ 0.001   $ 0.001   $ 0.001 $ 0.001    
Proceeds from issuance of common stock from underwritten public equity offering, net of issuance costs | $               $ 93,788          
Continuation Advances | $         $ 34,000 $ 18,000 $ 52,000 $ 34,000          
Period in which company must repay continuation advances if change-of-control transaction is entered into with third party               2 years          
Equity or debt financing that must be raised in a single transaction | $               $ 100,000          
Number of equity compensation plans | item       3       3     3    
Stock-based compensation | $               $ 12,258 $ 12,532        
Common Stock [Member]                          
Stockholders' Equity [Line Items]                          
Shares issued       22,345,000       22,345,000          
2010 Plan [Member]                          
Stockholders' Equity [Line Items]                          
Additional common stock reserved for issuance     7,700,000                    
2010 Director Plan [Member]                          
Stockholders' Equity [Line Items]                          
Additional common stock reserved for issuance     1,500,000                    
ESPP [Member]                          
Stockholders' Equity [Line Items]                          
Shares issued               834,677 1,306,329        
Additional common stock reserved for issuance     3,100,000                    
Common stock reserved for issuance       5,878,770       5,878,770     5,878,770    
Stock-based compensation | $       $ 1,800       $ 2,300          
Employee stock purchase rights offered                     0    
2020 Equity Incentive Plan [Member]                          
Stockholders' Equity [Line Items]                          
Shares authorized                       11,000,000  
Common stock reserved for issuance       7,900,000       7,900,000     7,900,000    
Shelf Registration Statement [Member]                          
Stockholders' Equity [Line Items]                          
Amount of common stock, preferred stock, depositiry shares, warrants, units or debt securities available in future public offerings | $                         $ 250,000
Access to capital makets, period 3 years                        
Underwriting Agreement [Member]                          
Stockholders' Equity [Line Items]                          
Public offering   19,430,000                      
Common stock, par value | $ / shares   $ 0.001                      
Common stock offering price per share | $ / shares   $ 4.47                      
Public offering, option to purchase additionl shares, period   30 days                      
Public offering, option to purchase additional shares, shares   2,914,500                      
Shares issued   22,300,000                      
Commissions, percentage of gross proceeds   6.00%                      
Proceeds from issuance of common stock from underwritten public equity offering, net of issuance costs | $   $ 93,900                      
Offering costs | $   $ 300   $ 200       $ 200     $ 200    
Stock Options [Member]                          
Stockholders' Equity [Line Items]                          
Stock-based compensation | $       1,400       4,200          
Options granted                   0      
Time-Based Restricted Stock Units (RSUs) [Member]                          
Stockholders' Equity [Line Items]                          
Stock-based compensation | $       1,700       5,500          
Performance-Based Restricted Stock Units (RSUs) [Member]                          
Stockholders' Equity [Line Items]                          
Stock-based compensation | $       $ 0       $ 0