Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity At-the-Market Offering (Details)

v3.21.2
Stockholders' Equity At-the-Market Offering (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 14, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Subsidiary, Sale of Stock [Line Items]                  
Number of shares authorized to be sold under equity distribution agreement (in shares)   35,000,000           35,000,000  
Number of common shares issued under equity distribution agreement and outstanding as of period-end (in shares)   7,502,435           7,502,435  
Accumulated proceeds from issuance of common shares under equity distribution agreement   $ 128,700           $ 128,700  
Number of shares of stock issued during period (in shares) 40,000,000                
Issuance of stock, net of offering costs $ 256,500 $ 256,611 $ 93 $ 99 $ 75 $ 95 $ 142    
At the Market Offering [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Number of shares of stock issued during period (in shares)   12,200     0     12,200 0
Issuance of stock, net of offering costs   $ 100     $ 0     $ 100 $ 0