The following information was taken from Twitter 10-K form (Annual report) filed with the Securities and Exchange Commission (SEC)

TWITTER, INC.
CONSOLIDATED BALANCE SHEETS
(In thousands)
ASSETS	31-Dec-15		31-Dec-16
Current assets:
Cash and cash equivalents	911,471		988,598
Short-term investments	2,583,877		2,785,981
Accounts receivable, net of allowance for doubtful accounts of $8,121 and $7,216 as of 31-Dec-15 and 31-Dec-16 respectively	638,694		650,650
Prepaid expenses and other current assets	247,750		226,967
Total current assets	4,381,792		4,652,196
Property and equipment, net	735,299		783,901
Intangible assets	141,015		95,334
Goodwill	1,122,728		1,185,315
Other assets	61,605		153,619
TOTAL ASSETS	6,442,439		6,870,365

The Company records accounts receivable at the invoiced amount. The Company maintains an allowance for doubtful accounts to reserve for potentially uncollectible receivable amounts. In evaluating the Companys ability to collect outstanding receivable balances, the Company considers various factors including the age of the balance, the credit-worthiness of the customer, which is assessed based on ongoing credit evaluations and payment history, and the customers current financial condition.

How much money (in thousands) do customers owe Twitter as of Dec-31-2016 for the services performed by Twitter? Put differently, what is the total value of unpaid invoices as of Dec-31-16?

A. 650,650
B. 638,694
C. 988,598
D. 657,866
E. 658,771