Net Income (Loss) per Share - Narrative (Details) - USD ($)			3 Months Ended		9 Months Ended
	Apr. 24, 2020	Feb. 13, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Dilutive awards (in shares)			166,000	134,000	114,000	130,000
2016 Equity Plan
Class of Stock [Line Items]
Dilutive awards (in shares)			41,640		35,662
Phantom Share Units (PSUs) | 2016 Equity Plan
Class of Stock [Line Items]
Common stock shares contingently issuable (in shares)					43,580
Phantom Share Units (PSUs) | 2016 and 2017 Equity Plans
Class of Stock [Line Items]
Settlement period					5 years
Restricted Stock Units (RSUs) | 2017 Equity Plan
Class of Stock [Line Items]
Dilutive awards (in shares)			44,252		35,492
Shares to be issued upon settlement of awards (in shares)			87,822		87,822
Common stock shares contingently issuable (in shares)					13,157
Restricted Stock Units (RSUs) | 2017 Equity Plan, February 2020 Award
Class of Stock [Line Items]
Restricted stock unit awards awarded (in shares)		420,303
Stock compensation expense			$ 900,000		$ 2,400,000
Restricted Stock Units (RSUs) | 2017 Equity Plan, April 2020 Award
Class of Stock [Line Items]
Restricted stock unit awards awarded (in shares)	56,715
Stock compensation expense			$ 87,800		$ 151,700
Service-based RSUs | 2017 Equity Plan
Class of Stock [Line Items]
RSUs excluded from computation of earnings per share (in shares)					281,588
Dilutive awards (in shares)			80,845		42,314
Service-based RSUs | 2017 Equity Plan, February 2020 Award
Class of Stock [Line Items]
Vesting period					3 years
Service-based RSUs | 2017 Equity Plan, April 2020 Award
Class of Stock [Line Items]
Vesting period	3 years
Service-based RSUs | 2016 Equity Plan
Class of Stock [Line Items]
RSUs excluded from computation of earnings per share (in shares)					52,221
Performance and market-based RSUs | 2017 Equity Plan
Class of Stock [Line Items]
RSUs excluded from computation of earnings per share (in shares)					447,295
Performance and market-based RSUs | 2017 Equity Plan, February 2020 Award
Class of Stock [Line Items]
Vesting period					3 years