2. Accounts Receivable	12 Months Ended
Dec. 31, 2018
Notes to Financial Statements
Accounts Receivable	At December 31, 2017 and 2018, the carrying value of the Company’s accounts receivable has been reduced to anticipated realizable value. As a result of this reduction of carrying value, the Company anticipates that substantially all of its net receivables reflected on the Consolidated Balance Sheets as of December 31, 2017 and 2018 will be collected. The allowance to reduce the receivables to anticipated net realizable value at December 31, 2017 was $1.5 million and at December 31, 2018 was $4.3 million. Adjustments for the valuation of receivables has been $1.1 in 2016, $440,000 in 2017 and $4.1 million in 2018.

Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.

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 210.5-02.3,4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration