Debt - Narrative (Details)				3 Months Ended				9 Months Ended
	Feb. 10, 2020 USD ($) $ / shares shares	Dec. 18, 2019 USD ($)	Apr. 15, 2019 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Treasury stock reissued (in shares) | shares	722,423
Shares issued price per share (in dollars per share) | $ / shares	$ 32.43
Treasury stock acquired average cost per share (in dollars per share) | $ / shares	$ 3.37
Loss on extinguishment of debt				$ 0		$ 0		$ (8,123,000)	$ 0
Issuance cost, equity component							$ 1,100,000
Income tax benefit, equity transaction							$ (4,100,000)
Current portion of long-term debt				657,000				657,000		$ 630,000
Subordinate Promissory Note | Restaurant Magic
Debt Instrument [Line Items]
Stated interest rate		4.50%
Liability, debt				1,500,000				1,500,000
Warranty liability assumed		$ 2,000,000.0
Monthly principal and interest payments		$ 60,391
Current portion of long-term debt				700,000				700,000
2020, remaining				100,000				100,000
2021				700,000				700,000
2022				700,000				700,000
Convertible Notes
Debt Instrument [Line Items]
Liability, debt				133,750,000				133,750,000
2020, remaining				0				0
2021				0				0
2022				0				0
Convertible Senior Notes due 2024 | Convertible Notes
Debt Instrument [Line Items]
Debt issued			$ 80,000,000.0	13,750,000				13,750,000
Stated interest rate			4.50%
Debt instrument, repurchased face amount	$ 66,300,000
Debt settlement amount	59,000,000.0
Settlement of equity component	30,800,000
Debt instrument pay off accrued interest	1,000,000.0
Loss on extinguishment of debt	8,100,000
Implied estimated effective rate			10.24%
Conversion ratio			0.0350217
Liability, debt			$ 62,400,000
Equity component of notes			$ 17,600,000
Issuance costs				4,900,000				4,900,000
Issuance costs, debt component				3,800,000				3,800,000
Issuance cost, equity component				1,100,000				1,100,000
Income tax benefit, equity transaction					$ (1,800,000)
Convertible Senior Notes Due 2026 | Convertible Notes
Debt Instrument [Line Items]
Debt issued	$ 120,000,000.0			120,000,000				120,000,000
Stated interest rate	2.875%
Implied estimated effective rate	7.33%
Conversion ratio	0.0232722
Liability, debt	$ 93,800,000
Equity component of notes	$ 26,200,000
Issuance costs				4,200,000				4,200,000
Issuance costs, debt component				3,300,000				3,300,000
Issuance cost, equity component				$ 900,000	900,000			900,000
Income tax benefit, equity transaction					$ (6,200,000)			$ 4,400,000