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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Accounts receivable, net | 6. Accounts receivable, net Accounts receivable, net consist of the following:
(In thousands) |  | December 31, 2017 |  |  | December 31, 2016 |
Accounts receivable |  | $ | 39,780 |  |  | $ | 31,748 |
Less: Allowance for doubtful accounts |  |  | (1,852 | ) |  |  | (790 | )
Total accounts receivable, net |  | $ | 37,928 |  |  | $ | 30,958 |
The movement of allowance for doubtful accounts is shown below:
|  | Year Ended December 31, |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Beginning balance |  |  | 790 |  |  |  | 318 |  |  |  | 105 |
Charges to expenses |  |  | 2,020 |  |  |  | 772 |  |  |  | 213 |
Write-offs |  |  | (958 | ) |  |  | (300 | ) |  |  | - |
Ending balance |  | $ | 1,852 |  |  | $ | 790 |  |  | $ | 318 |
Provision for bad debts of $2,020, $772 and $213 was provided for the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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