Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Summary of Significant Accounting Policies (Textual)

Increased cost of goods sold

$ 310

$ 2,300

Lower of cost or market adjustment which reduced inventory

97

1,100

Obsolete adjustment which reduced inventory

$ 2,400

4,000

Inventory raw material supply, description

The Company determined to lower its expected requirements for raw material inventory supply from five to three years and that it had excess material needed for future production.

Consumable stock write-down

$ 256

3,200

Revenue recognized

394

289

Total value of the contract

4,700

Value of contract recorded

4,700

Estimated contract value

26

217

Depreciation and amortization expense associated with property and equipment

1,200

6,100

Deposit at foreign financial institutions

1,200

681

Deposit at financial institutions amounts insured by FDIC and other

6,800

6,400

Research and development costs

962

2,550

Increased Costs of goods sold

1,400

130

Reduced cost of goods sold

451

Deferred tax assets

10,300

Cost of goods sold for inventory write downs

$ 4,700

$ 7,500