Debt - Narrative (Details) - USD ($)	1 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Exercise price of warrants (in dollars per share)				$ 6.08	$ 4.71			$ 4.85
Early termination costs				$ 1,956,000	$ 0
Write-off of debt issuance costs				$ 1,505,000	$ 0
2024 Notes
Debt Instrument [Line Items]
Proceeds from debt	$ 35,000,000.0
Interest rate				15.75%
Purchase of additional debt	$ 10,000,000.0
2022 Loan
Debt Instrument [Line Items]
Interest rate		9.75%
Principal amount of notes		$ 15,000,000.0
Receivables financing facility		2,500,000				$ 2,500,000
A/R facility, amount borrowed			$ 1,900,000
A/R facility, amount repayed			$ 1,900,000
Additional loan amount		7,500,000		$ 7,500,000
Additional loan, tranche one		2,500,000
Additional loan, tranche two		2,500,000
Additional loan, tranche three		2,500,000
First billings threshold for additional loan		5,000,000.0
Second billings threshold for additional loan		7,000,000.0
Third billings threshold for additional loan		$ 8,000,000.0
Warrants issued (in shares)		40,279
Term of warrants		7 years
Aggregate amount of debt purchased		$ 600,000
Duration of days preceding grant date		5 days
Exercise price of warrants (in dollars per share)		$ 9.93
Equity financing securities issuance period following agreement date		18 months
Payment to lender		$ 150,000
Percentage of outstanding principal balance		6.00%
Early termination costs				$ 1,100,000
2022 Loan | Other income/(expense)
Debt Instrument [Line Items]
Write-off of debt issuance costs		$ 1,500,000
2022 Loan | Maximum
Debt Instrument [Line Items]
Principal amount of notes						$ 7,500,000	$ 7,500,000
2022 Loan | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%