Short-Term Borrowings (Details)			6 Months Ended
	Sep. 05, 2017 USD ($)	Sep. 19, 2016 USD ($)	Jun. 30, 2017	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Minimum trailing adjusted EBITDA								$ (5,500,000)	$ (4,500,000)
Maximum add-back of restructuring costs in calculation of adjusted EBITDA								10,471,000	$ 10,786,000
Line of credit								16,000,000		$ 25,000,000
Forecasted
Line of Credit Facility [Line Items]
Minimum trailing adjusted EBITDA				$ 2,000,000	$ 0	$ (5,000,000)	$ (5,000,000)
Maximum add-back of restructuring costs in calculation of adjusted EBITDA				$ 2,000,000	$ 3,000,000	$ 11,000,000	$ 12,235,000
Below minimum trailing adjusted EBITDA
Line of Credit Facility [Line Items]
Minimum trailing adjusted EBITDA								8,000,000
Trade Accounts Receivable | Foreign | Maximum
Line of Credit Facility [Line Items]
Line of credit facility, eligible accounts receivable		85.00%
2016 Debt Agreement | Swingline loan
Line of Credit Facility [Line Items]
Line of credit facility current borrowings		$ 10.0
2016 Debt Agreement | Letter of Credit
Line of Credit Facility [Line Items]
Line of credit facility current borrowings		5.0
Line of Credit | 2016 Debt Agreement
Line of Credit Facility [Line Items]
Line of credit facility current borrowings		30.0
Line of credit facility, maximum borrowing capacity		25.0
Line of credit facility, eligible accounts receivable threshold		2,500,000
Debt Instrument, Interest Rate, Increase (Decrease)	0.50%
Line Of Credit Facility, Debt Covenant, Interest Rate Increase, Minimum EBITDA In Two Consecutive Quarters	$ 0
Line Of Credit Facility, Debt Covenant, Interest Rate Increase, Minimum Capital Raised	$ 15,000,000
Line of credit facility, annual administrative fee amount		25,000
Line of Credit facility, annual commitment fee		82,500
Deferred finance costs, net		$ 400,000
Line of credit								$ 16,000,000		$ 25,000,000
Line of Credit | 2016 Debt Agreement | Availability, 70 Percent Or More
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee percentage			0.35%
Line of Credit | 2016 Debt Agreement | Availability, 70 Percent Or More | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.75%	0.25%
Line of Credit | 2016 Debt Agreement | Availability, 30 Percent Or More And Less Than 70 Percent
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee percentage			0.325%
Line of Credit | 2016 Debt Agreement | Availability, 30 Percent Or More And Less Than 70 Percent | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		1.00%	0.50%
Line of Credit | 2016 Debt Agreement | Availability, Below 30 Percent
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee percentage			0.30%
Line of Credit | 2016 Debt Agreement | Availability, Below 30 Percent | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		1.25%	0.75%
Line of Credit | 2016 Debt Agreement | 8/31/17 through 12/31/17
Line of Credit Facility [Line Items]
Minimum liquidity ratio		1.50
Line of Credit | 2016 Debt Agreement | 1/31/2018 and 2/28/2018
Line of Credit Facility [Line Items]
Minimum liquidity ratio		1.35
Line of Credit | 2016 Debt Agreement | 3/31/2018
Line of Credit Facility [Line Items]
Minimum liquidity ratio		1.50
Line of Credit | 2016 Debt Agreement | 4/30/2018 and 5/31/2018
Line of Credit Facility [Line Items]
Minimum liquidity ratio		1.35
Line of Credit | 2016 Debt Agreement | 6/30/2018 and Thereafter
Line of Credit Facility [Line Items]
Minimum liquidity ratio		1.50
Line of Credit | 2016 Debt Agreement | Trade Accounts Receivable | Domestic
Line of Credit Facility [Line Items]
Line of credit facility, eligible accounts receivable		85.00%
Line of Credit | 2016 Debt Agreement | Trade Accounts Receivable | Foreign | Minimum
Line of Credit Facility [Line Items]
Line of credit facility, eligible accounts receivable		75.00%