Stock-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Options outstanding, beginning of year (in shares)	36,093	40,718	45,791
Options canceled, forfeited and expired (in shares)	(1,894)	(4,625)	(5,073)
Options outstanding, end of year (in shares)	34,199	36,093	40,718
Options vested and expected to vest, end of year (in shares)	34,199	36,093	40,718
Options exercisable, end of year (in shares)	16,968	17,991	20,286
Weighted Average Exercise Price
Options outstanding, beginning of year (in dollars per share)	$ 80.00	$ 80.00	$ 80.00
Options canceled, forfeited and expired (in dollars per share)	80.00	80.00	80.00
Options outstanding, end of year (in dollars per share)	80.00	80.00	80.00
Options vested and expected to vest, end of year (in dollars per share)	80.00	80.00	80.00
Options exercisable, end of year (in dollars per share)	$ 80.00	$ 80.00	$ 80.00
Weighted average remaining contractual life	1 month 6 days