Principal Industry (Details) - USD ($)	Aug. 09, 2019	Mar. 27, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Long term debt, face amount			$ 52,658,000	$ 140,974,000
Cash, cash equivalents, including restricted cash			66,286,000	58,205,000	$ 64,977,000	$ 86,064,000
Outside the United States
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, including restricted cash			27,000,000	33,900,000
First Lien Term Loan Facility Credit Agreement | Secured Debt
Cash and Cash Equivalents [Line Items]
debt outstanding			134,800,000
New Term Loan Agreement | Secured Debt
Cash and Cash Equivalents [Line Items]
debt outstanding			$ 122,482,000	$ 0
Covenant, EBITDA requirement	$ 34,000,000
Minimum liquidity requirement	$ 10,000,000
Subsequent Event | PPP Loan
Cash and Cash Equivalents [Line Items]
Long term debt, face amount		$ 10,000,000.0