Debt - Narrative (Details)				3 Months Ended
	Feb. 10, 2020 USD ($) $ / shares shares	Dec. 18, 2019 USD ($)	Apr. 15, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Current portion of long-term debt				$ 639,000	$ 630,000
Convertible Notes
Debt Instrument [Line Items]
Liability, debt				133,750,000
2020, remaining				0
2021				0
2022				0
Convertible Senior Notes due 2024 | Convertible Notes
Debt Instrument [Line Items]
Debt issued			$ 80,000,000.0	13,750,000
Stated interest rate			4.50%
Repayment of convertible debt	$ 66,300,000
Shares issued upon conversion (in shares) | shares	722,423
Price of shares issued upon conversion (in dollars per share) | $ / shares	$ 32.43
Average cost basis (in dollars per share) | $ / shares	$ 3.37
Liability, debt	$ 59,000,000		$ 62,400,000
Equity component of notes	30,800,000		$ 17,600,000
Repayment of interest accrued	1,000,000
Loss on settlement	8,100,000
Implied estimated effective rate			10.24%
Conversion rate			0.0350217
Issuance costs				4,900,000
Issuance costs, debt component				3,800,000
Issuance cost, equity component				1,100,000
Convertible Senior Notes Due 2026 | Convertible Notes
Debt Instrument [Line Items]
Debt issued	$ 120,000,000.0			120,000,000
Stated interest rate	2.875%
Liability, debt	$ 93,800,000
Equity component of notes	$ 26,200,000
Implied estimated effective rate	7.33%
Conversion rate	0.0232722
Issuance costs				4,200,000
Issuance costs, debt component				3,100,000
Issuance cost, equity component				1,100,000
Income tax benefit, equity transaction				5,400,000
Subordinate Promissory Note | Restaurant Magic
Debt Instrument [Line Items]
Stated interest rate		4.50%
Liability, debt				1,800,000
Warranty liability assumed		$ 2,000,000
Monthly principal and interest payments		60,391
Current portion of long-term debt				$ 700,000
2020, remaining		500,000
2021		700,000
2022		$ 700,000