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Stockholder Rights Plan	12 Months Ended
Stockholder Rights Plan	Dec. 31, 2018
Equity [Abstract]
Stockholder Rights Plan	Stockholder Rights Plan On March 27, 2018, our Board of Directors authorized the redemption of all outstanding preferred share purchase rights issued pursuant to the then existing Rights Agreement. Under the former Rights Agreement, one right was attached to each outstanding share of common stock. The rights were redeemed at a redemption price of $0.01 per right, resulting in a total payment of $0.4 million to the holders of the rights as of the close of business on March 27, 2018.