Long-Term Debt - Narrative (Details)	1 Months Ended
	Mar. 31, 2018 USD ($) installment	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Outstanding balance		$ 17,394,000	$ 17,471,000
2014 Pacific Western Bank, Term and Revolving Loans
Debt Instrument [Line Items]
Debt instrument, face amount	$ 25,000,000.0
2014 Pacific Western Bank, Term and Revolving Loans | Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount	$ 15,000,000.0
Number of monthly installments | installment	36
Outstanding balance		13,500,000	13,500,000
2014 Pacific Western Bank, Term and Revolving Loans | Term Loan | Prime Rate
Debt Instrument [Line Items]
Basis on variable rate	0.50%
Variable rate floor	5.00%
2014 Pacific Western Bank, Term and Revolving Loans | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Outstanding balance		$ 3,700,000	$ 3,700,000
2014 Pacific Western Bank, Term and Revolving Loans | Revolving Credit Facility | Line of Credit | Borrowing Capacity less Unpaid Principal Amount
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 25,000,000.0
2014 Pacific Western Bank, Term and Revolving Loans | Revolving Credit Facility | Line of Credit | Borrowing Capacity as a Percentage of Accounts Receivable
Debt Instrument [Line Items]
Borrowing base as a percentage of eligible accounts receivable	85.00%
Borrowing base, basis spread, amount	$ 5,500,000.0
Borrowing base, basis spread, percentage of eligible inventory	35.00%