Business Overview, Basis of Presentation and Recent Accounting Pronouncements (Details) - USD ($)	Mar. 29, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Common stock, par value (in usd per share)		$ 0.01		$ 0.01
Total operating lease liabilities		$ 10,519,000
Operating lease right-of-use assets		8,373,000
Other long-term liabilities		$ 10,221,000		$ 2,119,000
ASU 2016-02
Lessee, Lease, Description [Line Items]
Total operating lease liabilities			$ 8,400,000
Operating lease right-of-use assets			8,400,000
Other long-term liabilities			$ 10,500,000
ATM Agreement
Lessee, Lease, Description [Line Items]
Common stock, par value (in usd per share)	$ 0.01
Sale of stock, consideration received on transaction	$ 150,000,000
Commission percentage	3.00%