Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Income tax rate		35.00%	35.00%	35.00%
Provisional net tax benefit on re-measurement of deferred tax balances		$ 17,600,000
Provisional estimate of one-time transition tax liability for foreign subsidiaries, net of related foreign tax credits		1,400,000
Additional income taxes for remaining undistributed foreign earnings not subject to transition tax		$ 0
Operating loss carryforwards expiration term		20 years
Deferred tax assets, valuation allowance		$ 1,636,000	$ 1,131,000	$ 933,000	$ 542,000
Valuation allowance, deferred tax asset, increase (decrease), amount		505,000	198,000	391,000
Unrecognized tax benefits		820,000	1,185,000	$ 400,000	$ 702,000
Unrecognized tax benefits that would impact effective tax rate		700,000	1,000,000
Unrecognized tax benefits, income tax penalties and interest accrued		200,000	200,000
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit		$ 700,000
Earliest Tax Year | Internal Revenue Service (IRS)
Income Taxes [Line Items]
Open tax year		2013
Earliest Tax Year | State and Foreign Jurisdictions
Income Taxes [Line Items]
Open tax year		2013
Latest Tax Year | Internal Revenue Service (IRS)
Income Taxes [Line Items]
Open tax year		2016
Latest Tax Year | State and Foreign Jurisdictions
Income Taxes [Line Items]
Open tax year		2016
Foreign Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards		$ 4,100,000	4,100,000
Deferred tax assets, valuation allowance		1,100,000	1,100,000
Valuation allowance, deferred tax asset, increase (decrease), amount		500,000
Domestic Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards		$ 8,500,000
Net operating loss carry-forwards, expiration year		2034
State and Local Jurisdiction
Income Taxes [Line Items]
Tax credit carry-forward, amount		$ 2,800,000
Deferred tax assets, tax credit carry-forwards		$ 1,785,000	$ 1,784,000
State and Local Jurisdiction | Earliest Tax Year
Income Taxes [Line Items]
Tax credit carry-forwards, expiration year		2017
State and Local Jurisdiction | Latest Tax Year
Income Taxes [Line Items]
Tax credit carry-forwards, expiration year		2026
Scenario, Forecast
Income Taxes [Line Items]
Income tax rate	21.00%