Government Incentives - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2018 USD ($)	May 04, 2019 USD ($) Job	May 05, 2018 USD ($)	Feb. 02, 2019 USD ($)
Government Incentive Assistance Program [Line Items]
Deferred tax assets		$ 3,314		$ 2,671
Grow New Jersey Assistance Program (Grow NJ)
Government Incentive Assistance Program [Line Items]
Income tax credits granted from state incentive package		$ 40,000
Transferrable income tax credit period		10 years
Government incentive assistance program award period		10 years
Project development, eligible amount per new full time job		$ 7
Government incentive assistance program annual award limit		$ 4,000
Award compliance period		5 years
Award Compliance Description		After the end of the ten-year Grow NJ award earnings period there is a five-year compliance period during which the Company must maintain the average of its annual eligible jobs certified during the preceding ten years or a pro-rata amount up to one-tenth of the previously awarded income tax credits would be subject to recapture and repayment to the State of New Jersey annually during the five-year compliance period.
Agreement to sell annual income tax credits awarded, Description		up to 100%
Deferred tax assets		$ 3,314		$ 2,671
Cash proceeds net of costs from government incentive assistance program	$ 2,829
Cost reduction related to award		$ 617	$ 710
Grow New Jersey Assistance Program (Grow NJ) | Minimum
Government Incentive Assistance Program [Line Items]
Government incentive assistance program number of eligible jobs | Job		100