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Recent Accounting Pronouncements - Summary of Adoption Impact of ASC 326 on Unaudited Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Assets      
Accounts receivable $ 32,497   $ 42,322
Other non-current assets 15,362   12,121
Equity      
Accumulated deficit (1) $ (1,630,688)   (1,376,142) [1]
Accounting Standards Update 2016-13 [Member]      
Assets      
Accounts receivable   $ 41,918  
Other non-current assets   12,046  
Equity      
Accumulated deficit (1) [1]   $ (1,379,807)  
Difference Between Guidance in Effect Before and After ASC Three Two Six [Member] | Accounting Standards Update 2016-13 [Member]      
Assets      
Accounts receivable     (404)
Other non-current assets     (75)
Equity      
Accumulated deficit (1) [1]     $ (3,665)
[1] The impact of the adoption of ASC 326 includes the impacts related to our discontinued operations of $1.0 million related to accounts receivable, $0.4 million related to prepaid and other current assets, and $1.8 million related to other non-current assets, for a total impact of $3.7 million when combined with the amounts related to continuing operations