Shareholders' Deficit - Schedule of Activity in Shares of Common Stock (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common shares	33,715,000	33,090,000	32,733,000
Ending balance, common shares	50,192,000	33,715,000	33,090,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity issuance - UST commitment fee	15,944,000
Issuance of equity awards, net	533,000	625,000	357,000