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Credit Facility and Term Loans - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 16, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Available balance of credit facility |  | $ 1,100,000 |  | $ 1,100,000 |  | $ 1,400,000 | $ 5,600,000 |
Interest expense |  | 1,288,000 | $ 506,000 | 2,501,000 | $ 1,063,000 |  |  |
Repayments of lines of credit |  |  |  | 35,229,000 | 12,816,000 |  |  |
Borrowings, outstanding |  | 31,900,000 |  | 31,900,000 |  | 27,500,000 | $ 10,300,000 |
Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility maximum borrowing amount |  |  |  |  |  | $ 15,000,000 |  |
Interest expense |  | 500,000 |  | 1,000,000 |  |  |  |
Amortization of debt issuance costs |  | 100,000 |  |  |  |  |  |
Debt instrument maturity month and year |  |  |  |  |  | 2023-01 |  |
Borrowings, outstanding |  | 15,000,000 |  | 15,000,000 |  |  |  |
Horizon Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt offset against and expense over the term |  |  |  |  |  | 5 years |  |
Warrants term |  |  |  |  |  | 10 years |  |
Fair value on issuance |  |  |  |  |  | $ 900,000 |  |
Debt discount |  |  |  |  |  | 900,000 |  |
Deferred debt issuance costs |  | 976,000 |  | 976,000 |  | $ 1,022,000 |  |
Horizon Term Loan | Common Stock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Warrants to purchase shares |  |  |  |  |  | 76,923 |  |
Warrants to purchase shares, exercise price |  |  |  |  |  | $ 15.60 |  |
Horizon Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of lines of credit |  |  |  |  |  | $ 4,900,000 |  |
Line of credit, prepayment penalty |  |  |  |  |  | $ 100,000 |  |
Maximum | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  | $ 300,000 |  |  |  |
Prior Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  | 200,000 |  | 500,000 |  |  |
Prior Term Loan | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  | 100,000 |  | 100,000 |  |  |
London Interbank Offered Rate (LIBOR) | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 9.90% |  |
Description of variable rate basis |  |  |  | one-month LIBOR |  |  |  |
London Interbank Offered Rate (LIBOR) | Minimum [Member] | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Potential additional interest |  |  |  |  |  | 2.50% |  |
Mid Cap Prior Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility maximum borrowing amount | $ 25,000,000 |  |  |  |  |  |  | $ 15,000,000
Unamortized debt issuance costs |  |  |  |  |  | $ 700,000 |  |
Mid Cap Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Additional increase in borrowing amount | $ 50,000,000 |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage | 0.50% |  |  |  |  |  |  |
Line of credit facility, minimum liquidity financial covenant requirement in cash on hand | $ 5,000,000 |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 1,300,000 |  |
Debt offset against and expense over the term |  |  |  |  |  | 3 years |  |
Line of credit, outstanding |  | 20,400,000 |  | $ 20,400,000 |  | $ 16,500,000 |  |
Available balance of credit facility |  | 1,100,000 |  | 1,100,000 |  | 1,400,000 |  |
Mid Cap Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 5.75% |  |  |  |  |  |  |
Mid Cap Prior Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term loan, borrowing |  |  |  |  |  |  |  | $ 7,000,000
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense |  | 800,000 | 300,000 | 1,500,000 | 600,000 |  |  |
Amortization of debt issuance costs |  | $ 200,000 | $ 100,000 | $ 400,000 | $ 200,000 |  |  |
Credit Facility and Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility covenant minimum liquidity requirement in unrestricted cash |  |  |  |  |  | $ 5,000,000 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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