Acquisitions, Litigation, and Other Charges - Components of Charges (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Acquisition, Litigation and Other Special Charges [Abstract]
Acquisition related costs	$ 2,671,000	$ 21,000	$ 19,126,000	$ 72,000
Litigation	197,000	0	1,574,000	0
Other:
Severance, equity award modifications and acceleration	1,031,000	0	7,965,000	2,053,000
Non-offering related equity issuance expenses	(29,000)	604,000	1,318,000	1,846,000
Non-recurring public company implementation costs	0	496,000	0	658,000
Terminated site operations costs	(90,000)	73,000	254,000	139,000
Total other	912,000	1,173,000	9,537,000	4,696,000
Total acquisition, litigation and other	$ 3,780,000	$ 1,194,000	$ 30,237,000	$ 4,768,000