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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 39 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revenues | $ 30,368,000 | $ 14,588,000 | $ 48,213,000 | $ 28,904,000 | $ 6,200,000 |
Level 2 | Horizon Term Loan |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Fair value of borrowings | 14,700,000 |  | 14,700,000 |  |  | $ 14,700,000
Level 1 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and restricted cash | 40,000,000 |  | 40,000,000 |  |  |
Shipping and Handling |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revenues |  |  | 100,000 |  |  |
Maximum | Shipping and Handling |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revenues |  | $ 100,000 |  |  |  |
Accrued Liabilities |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Refund liabilities for sales returns | $ 500,000 |  | $ 500,000 |  |  | $ 300,000

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=108792157&loc=SL49130611-203046-203046 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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